public static MeshBuilder buildMesh(float[,] voxVals, Sub[,] subs)
{
MeshBuilder mb = new MeshBuilder();
int l = voxVals.GetLength(0), w = voxVals.GetLength(1);
//array of voxels
SVox[,] voxels = new SVox[l, w];
//create all the voxel objects
for (int x = 0; x < l; x++)
{
for (int y = 0; y < w; y++)
{
voxels[x, y] = new SVox(x, y, voxVals[x, y] < surface);
}
}
//fill in all voxel edge data
for (int x = 0; x < l; x++)
{
for (int y = 0; y < w; y++)
{
//if the voxel is not the rightmost one and the edge will be used(different states), calculate its right edge
if (x < l - 1 && (voxels[x, y].state ^ voxels[x + 1, y].state))
{
float percent = .5f;
//if they are not the same, use linear interpolation to find the percent
if (voxVals[x, y] != voxVals[x + 1, y])
{
percent = (surface - voxVals[x, y]) / (voxVals[x + 1, y] - voxVals[x, y]);
}
voxels[x, y].xEdge = voxels[x, y].pos + new Vector3(percent, 0, 0);
}
if (y < w - 1 && (voxels[x, y].state ^ voxels[x, y + 1].state))
{
float percent = .5f;
//if they are not the same, linear interpolation
if (voxVals[x, y] != voxVals[x, y + 1])
{
percent = (surface - voxVals[x, y]) / (voxVals[x, y + 1] - voxVals[x, y]);
}
voxels[x, y].yEdge = voxels[x, y].pos + new Vector3(0, percent, 0);
}
}
}
//finally, march the squares
//there are 1 fewer squares than verts/voxels in each dimension
for (int x = 0; x < l - 1; x++)
{
for (int y = 0; y < w - 1; y++)
{
marchSquare(mb, voxels[x, y], voxels[x + 1, y], voxels[x, y + 1], voxels[x + 1, y + 1], subs[x, y]);
}
}
return(mb);
}
//build the mesh of the square made up of these four voxels
private static void marchSquare(MeshBuilder mb, SVox v1, SVox v2, SVox v3, SVox v4, Sub sub)
{
//calculate the cell type
int cellType = 0;
if (v1.state)
{
cellType |= 1;
}
if (v2.state)
{
cellType |= 2;
}
if (v3.state)
{
cellType |= 4;
}
if (v4.state)
{
cellType |= 8;
}
//Sub sub = Sub.Foyaite;
//now build the mesh based on the cell type
switch (cellType)
{
case 0:
return;
case 1:
ProcMesh.addTri(mb, v1.pos, v1.yEdge, v1.xEdge, sub);
return;
case 2:
ProcMesh.addTri(mb, v2.pos, v1.xEdge, v2.yEdge, sub);
return;
case 3:
ProcMesh.addQuad(mb, v1.pos, v1.yEdge, v2.yEdge, v2.pos, sub);
return;
case 4:
ProcMesh.addTri(mb, v3.pos, v3.xEdge, v1.yEdge, sub);
return;
case 5:
ProcMesh.addQuad(mb, v1.pos, v3.pos, v3.xEdge, v1.xEdge, sub);
return;
case 6:
ProcMesh.addTri(mb, v3.pos, v3.xEdge, v1.yEdge, sub);
ProcMesh.addTri(mb, v2.pos, v1.xEdge, v2.yEdge, sub);
//ProcMesh.addQuad(mb, v1.yEdge, v3.xEdge, v2.yEdge, v1.xEdge, Sub.Limestone);
return;
case 7:
ProcMesh.addTri(mb, v1.pos, v3.pos, v2.pos, sub);
ProcMesh.addQuad(mb, v3.pos, v3.xEdge, v2.yEdge, v2.pos, sub);
return;
case 8:
ProcMesh.addTri(mb, v4.pos, v2.yEdge, v3.xEdge, sub);
return;
case 9:
ProcMesh.addTri(mb, v1.pos, v1.yEdge, v1.xEdge, sub);
ProcMesh.addTri(mb, v4.pos, v2.yEdge, v3.xEdge, sub);
//ProcMesh.addQuad(mb, v1.yEdge, v3.xEdge, v2.yEdge, v1.xEdge, Sub.Limestone);
return;
case 10:
ProcMesh.addQuad(mb, v2.pos, v1.xEdge, v3.xEdge, v4.pos, sub);
return;
case 11:
ProcMesh.addTri(mb, v1.pos, v4.pos, v2.pos, sub);
ProcMesh.addQuad(mb, v1.pos, v1.yEdge, v3.xEdge, v4.pos, sub);
return;
case 12:
ProcMesh.addQuad(mb, v3.pos, v4.pos, v2.yEdge, v1.yEdge, sub);
return;
case 13:
ProcMesh.addTri(mb, v1.pos, v3.pos, v4.pos, sub);
ProcMesh.addQuad(mb, v1.pos, v4.pos, v2.yEdge, v1.xEdge, sub);
return;
case 14:
ProcMesh.addTri(mb, v3.pos, v4.pos, v2.pos, sub);
ProcMesh.addQuad(mb, v3.pos, v2.pos, v1.xEdge, v1.yEdge, sub);
return;
case 15:
//ProcMesh.addQuad(mb, v1.pos, v3.pos, v4.pos, v2.pos, sub);//Sub.TEST);
return;
default:
return;
}
}
